A Facile Synthesis and Discovery of Highly Functionalized Tetrahydro-pyridines and Pyridines as Antimycobacterial Agents
作者:Suresh Kumar Raju、Michael Rajesh Stephen、Perumal Subbu、Banerjee Debjani、Yogeeswari Perumal、Sriram Dharmarajan
DOI:10.1248/cpb.58.602
日期:——
The four-component reaction of ethyl-3-oxo-4-(arylsulfanyl)butanoate, substituted aromatic aldehydes and ammonium acetate afforded novel ethyl 4-hydroxy-2,6-diaryl-5-(arylsulfanyl)-1,2,5,6-tetrahydro-3-pyridinecarboxylates. These tetrahydro-pyridine esters upon dehydrogenation with dichlorodicyanobenzoquinone (DDQ) afforded highly functionalized pyridines in excellent yields. These novel heterocycles were screened for their in vitro activity against Mycobacterium tuberculosis H37Rv using agar dilution method. Among the compounds screened, ethyl 2,6-di(2-bromophenyl)-4-hydroxy-5-(phenylsulfanyl)-3-pyridinecarboxylate was found to be the most active with a minimum inhibitory concentration of 1.33 μM against Mycobacterium tuberculosis and is 5.74 and 38.17 times more potent than the first line anti-tuberculosis (TB) drugs, ethambutol and pyrazinamide respectively.
由乙基-3-氧代-4-(芳硫基)丁酸酯、取代芳香醛和乙酸铵进行四组分反应,得到了新型乙基4-羟基-2,6-二芳基-5-(芳硫基)-1,2,5,6-四氢-3-吡啶甲酸酯。这些四氢吡啶酯经二氯二氰苯醌(DDQ)脱氢反应后,以优异的产率得到了功能化的吡啶。这些新型杂环化合物通过琼脂稀释法对其体外抗结核活性进行了筛选,发现乙基2,6-二(2-溴苯基)-4-羟基-5-(苯硫基)-3-吡啶甲酸酯活性最高,其对结核杆菌的最低抑制浓度为1.33微摩尔,比一线抗结核药物乙胺丁醇和吡嗪酰胺分别强5.74倍和38.17倍。